[SIADH as only paraneoplastic cause of the small cell lung cancer].

62 years old patient was admitted to the hospital with weakness of lower extremities. Using laboratory examination, we found very severe hyponatrenaemia, hypochloraemia and hypotonia of blood plasma, because of SIADH. We searched for the cause of that syndrome and finally we found that the cause of that syndrome was small cell lung cancer with an expansion into the mediastinum and metastases into the skelet.